Sediments in Broad Estuary of Amazon River, Brazil

Dense brown sediments spill forth from the mouth of the Amazon River of South America, the second longest river in the world and by far the largest by waterflow with an average discharge greater than the next seven largest rivers combined.

The river enters the Atlantic Ocean in a broad estuary about 240 kilometres (150 mi) wide. The mouth of the main stem is 80 kilometres (50 mi). Because of its vast dimensions, it is sometimes called The River Sea.